Ford conundrum???...

^^^ It's not just the "cheapo" Chinese stuff either. I have a MSD 8595 billet ready to run dizzy with a 6AL box on the 390FE in my Fairlane. After I freshened up the motor I could not get the MSD dizzy to drop in all the way.. it was tight as heck. I suspected it shipped with the wrong gear installed as the stock dizzy still dropped right in. Several exchanges with MSD support they concluded "core shift" was my issue and wanted noting to do with me afterwards. I ordered the correct MSD gear and installed it.. the MSD dizzy dropped right in first try. I nearly sent them the factory installed gear with a tag that said.. "here's your core shift"...lol.